Finding the Fourth Proportional to 1,120.50, 1,546.31 and 678.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.50 : 1,546.31 = 678.45 : x
2. Step 2: Convert to fraction form
   1,120.50/1,546.31 = 678.45/x
3. Step 3: Cross multiply
   1,120.50x = 1,546.31 × 678.45
4. Step 4: Simplify right side
   1,120.50x = 1,049,094.02
5. Step 5: Solve for x
   x = 1,049,094.02/1,120.50
6. Step 6: Final answer
   x = 936.27